United’s £89million world-record signing faces off against his older sibling at Old Trafford on Thursday (8.05pm).

Jose Mourinho’s men are preparing for their Europa League round of 32 first leg, with Paul Pogba expected to start.

Florentin is also set to feature from the beginning in Saint Etienne’s defence, having started their last three games in Ligue 1.

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Paul Pogba and Anthony Martial may both start for Manchester United against Saint Etienne

They are well known for being big jokers and mickey-takers

Anthony Martial

Martial knows how much Thursday’s showdown means to his United and France team-mate.

And while strong personalities will shine through before and after the game, the 90 minutes of action will be hotly and seriously contested.

"They are well known for being big jokers and mickey-takers but, once they are on the field, it will be like two warriors who are going all out to win the game," Martial told the club’s official website.